package com.example.blogsystem.config;

import com.example.blogsystem.common.GlobalVariable;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 登录拦截器
 */
public class LoginIntercept implements HandlerInterceptor {
    /**
     * true -> 用户已经登录
     * false -> 用户未登录
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        if (session == null || session.getAttribute(GlobalVariable.USER_SESSION_KEY) == null) {
            response.sendRedirect("/login.html");
            return false;
        }
        return true;
    }
}
